In Greek mythology, the upper regions of the atmosphere (5)

I believe the answer is:

ether

(Other definitions for ether that I've seen before include "Former anaesthetic" , "What's clear" , "Volatile solvent" , "Type of chemical" , "Anaesthetic is, strangely, there" .)

I've seen this clue in The Mirror.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.